Convert SPREADSHEETML to XLSB Online for Free. Free Online SPREADSHEETML to XLSB Converter. Python SPREADSHEETML to XLSB. SPREADSHEETML to XLSB via Python....import Workbook workbook = Workbook( "Input.xlsx" ) workbook.save(...SPREADSHEETML file with an instance of Workbook Convert SPREADSHEETML to XLSB...